1902 - 3 .] Abdominal Viscera of Cercocebus fuliginosus, etc. 517 
The liver of Cercocebus appears to be of relatively large size, that 
part of it which lies to the right of the mesial plane being decidedly 
larger than that on the left. On first opening the abdomen, the 
central lobes are seen to project beyond the limits of the thoracic 
wall. The measurements of the liver are as follows : — 
Greatest transverse diameter = 110 mm. 
,, dorso-ventral „ = 105 mm. 
,, cephalo-caudal ,, = 95 mm. 
Taken as a whole, it may be described as having three surfaces. 
The cephalic surface is the smallest of the three, and is in the form 
of a triangle whose apex points ventrally. Its convexity is most 
marked in a transverse direction. An examination of fig. 1 shows 
the lines along which the peritoneum is reflected ; in connection 
with which it is interesting to notice the large size of the bare 
area as compared with Lagothrix. The visceral surface , concave in 
all directions, looks dorsalwards as well as towards the pelvis. 
Its relations are shown in fig. 2. The third surface may be called 
ventro-lateral , since it is really a combination of a ventral and 
two lateral surfaces. It is not clearly defined from the cephalic 
surface, and the two might have been described together as the 
diaphragmatic surface ; but this was not considered advisable, 
as the two surfaces look in different directions. The ventro- 
lateral surface is markedly convex in a transverse direction 
this convexity being most pronounced ventrally. A little to the 
left of the line of attachment of the falciform ligament, there is a 
shallow wide groove which extends for a short distance on to the 
cephalic surface. It seems likely that this is produced by some 
projecting border of lung ; but, the thorax not having been opened 
as yet, this is only a conjecture. 
All the fissures and lobes of the typical liver are present in 
Cercocebus. The umbilical fissure is very well marked, crossing 
the visceral surface from the portal fissure to the margo acutus, 
and being continued on the ventro-lateral surface almost as far as 
the boundary of the cephalic surface. The left lateral is the most 
complete of all the fissures, entirely isolating the left lateral lobe 
from the bulk of the liver (figs. 1 and 2). The right lateral 
fissure stands next in order of completeness. Beginning at the 
